Smart thermostats / Comparison

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Wi-Fi connected 24 V low-voltage thermostats sold new in the US. Line-voltage thermostats, pro-only equipment interface modules, utility-program packages and measured energy savings are outside this catalogue.

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Documented specifications and exact purchase packages
Compare the details	Nest Learning Thermostat (4th gen), Polished Silver (Google Store, US)
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US purchase package	Nest Learning Thermostat (4th gen) in Polished Silver, single thermostat with one Nest Temperature Sensor (2nd gen) in the box, sold on the US Google Store. Product & sources Box list: thermostat display, thermostat base, trim plate, steel plate, mounting screws and wiring labels, Nest Temperature Sensor (2nd gen). Polished Obsidian and Polished Gold are other colors of the same package. Price, availability and checkout were not verified. Sources · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Google: Nest Learning Thermostat (4th gen) Google Store overviewChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Where to buy	Select: Nest Learning Thermostat (4th gen) in Polished Silver, single thermostat with one Nest Temperature Sensor (2nd gen) in the box, sold on the US Google Store. View at Google Store — Nest Learning Thermostat (4th gen), Polished Silver (Google Store, US); opens in a new tab The link may open several packages. Check current price and availability with the seller. Opens in a new tab.
Documented HVAC support The manufacturer's published supported-system and stage statement, kept close to its wording. This is a published compatibility list, not an installation guarantee. Use the manufacturer's compatibility checker and your actual wiring before buying.	Works with most 24V systems, including gas, electric, oil, forced air, heat pump, and radiant. Heating 1, 2 and 3 stages (W1, W2, W3); cooling 1, 2 and 3 stages (Y1, Y2, Y3); fan (G, G2, G3); power (C, RH, RC). Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Heat pump stages Published heat pump compressor and auxiliary or emergency heat stage support. Heat pump staging differs from conventional staging. Dual-fuel and balance-point behavior must be confirmed separately for your equipment.	Heat pump up to 3 stages with 1 or 2 stages of auxiliary/alternate and emergency heat (O/B, AUX, AUX2, E). Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Accessory terminal support Documented humidifier, dehumidifier or ventilator accessory control and any terminal limits. One shared accessory terminal is not the same as independent control of several accessories. Some accessories need an isolation relay.	Humidifier and dehumidifier (HUM, DEHUM) and ventilation (VENT). The star connector accepts only one of W3, Y3, G3, E, HUM or DEHUM; AQ+ and AQ- accept Y3 or a 1-wire or 2-wire VENT, HUM or DEHUM. Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
C-wire requirement The manufacturer's statement about needing a common (C) wire and how the thermostat is powered without one. A design that works without a C wire in most homes can still require one for particular systems. Treat percentages as manufacturer statements.	Designed to work whether or not the home has a C wire (Power Sharing). In limited cases, stated as under 1%, a C wire or Nest Power Connector may be necessary. Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Power adapter or extender in this package Whether the selected US package ships with a C-wire adapter, power extender kit or power connector. An accessory sold separately or promoted free in one channel is not box content. Check the exact package before ordering.	NoThe Nest Power Connector is not in the box list. Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Remote sensors in this package Count of wireless room or temperature sensors supplied in the selected US package. Zero included does not establish that sensors are unsupported; some thermostats do not support any remote sensor at all.	1 sensorsOne Nest Temperature Sensor (2nd gen) included; up to six per thermostat are supported. Sources · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Google: Nest Learning Thermostat (4th gen) Google Store overviewChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Wireless connectivity Documented Wi-Fi bands and other radios in the thermostat. A 2.4 GHz-only radio needs that band enabled on your router. A listed radio does not by itself establish Thread or Matter support.	Wi-Fi 802.11n (2.4 GHz / 5 GHz); built-in rechargeable lithium battery powered from HVAC wiring. Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Matter certified Whether the manufacturer documents Matter certification or Matter control. Matter control may still require the maker's app for setup. Matter is not the same as a native Alexa, Google or HomeKit integration.	YesWorks with Google Home and Matter; the store FAQ calls it Matter-certified. Sources · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Google: Nest Learning Thermostat (4th gen) Google Store overviewChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Thread radio documented Whether the manufacturer explicitly documents Thread support. An 802.15.4 or sub-GHz radio listing is not a Thread claim. Unknown means no explicit statement was found.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. No Thread radio is named on the spec or support pages. Sources · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Google Nest Help: Nest thermostat technical specificationsChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Apple HomeKit or Apple Home named Whether the manufacturer names Apple HomeKit or Apple Home as a supported platform. Matter-only compatibility with Apple Home is not recorded as HomeKit support unless the manufacturer names Apple.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. Control through Google Home and other Matter-enabled apps is stated; Apple Home or HomeKit is not named. Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Display and control Documented screen type, size or resolution and the primary local control method. Screen size does not rank usability. Some thermostats are controlled by a side touch strip or ring rather than a touchscreen.	2.7 inch (68 mm) circular LCD, 600 x 600 pixels, with Dynamic Farsight. Sources · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Google: Nest Learning Thermostat (4th gen) Google Store overviewChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Built-in humidity sensor Whether the thermostat itself documents a humidity sensor. Sensing humidity is separate from controlling a humidifier or dehumidifier, which depends on accessory support and wiring.	Yes Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Built-in air quality monitoring Whether the manufacturer documents an indoor air quality sensor in the thermostat. Air quality monitoring names a feature, not a measured accuracy. The sensed parameters may not be published.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. The sensor list names Soli, temperature, humidity and ambient light; no indoor air quality sensor is listed. Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Built-in occupancy or motion sensor Whether the thermostat documents a built-in occupancy, motion or radar sensor. Geofencing through a phone and remote sensors are different mechanisms from a sensor in the thermostat.	YesSoli radar sensor for Motion Sense. Source · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
App, account and subscriptions The documented app required for setup and any optional or required subscriptions. Core heating and cooling control normally works without a paid plan; security or filter services are separate subscriptions.	Installation and setup requires the Google Home app; control through Google Home or Matter-enabled apps. Nest Renew is an optional free service. Sources · 2026-10-21 Google: Nest Learning Thermostat (4th gen) specs and wiring compatibilityChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.Google: Nest Learning Thermostat (4th gen) Google Store overviewChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Questions to check before buying	A published compatibility list is a manufacturer statement, not a tested installation guarantee; the manufacturer compatibility checker and the actual wiring decide. The spec page lists the trim plate and steel plate as included accessories; the Nest Power Connector is not in the box list. Energy savings figures on the manufacturer pages are marketing claims and are not recorded as facts.

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